[Role of lipid transfers in intravascular lipoprotein metabolism in human].

Human lipoproteins after their intestinal or hepatic synthesis undergo within vascular compartment important remodeling through the agency of endothelial lipases, Lecithin: Cholesterol Acyl Transferase and lipid transfer proteins, Cholesteryl Ester Transfer Protein (CETP) and Phospholipid Transfer Protein (PLTP). Following CETP and PLTP characteristics presentation, transfer proteins activities and role were described specifying notably mechanism and kinetic models of cholesteryl ester transfer reaction (shuttle and ternary collision complex mechanisms). Comparative study of Phospholipid Transfer Activities mediated by CETP and PLTP has shown that phospholipid transfer activities of PLTP and CETP are different and might rely on distinct mechanisms. PLTP mediated phospholipid transfers modulate cholesteryl ester transfer activity of CETP. In vivo PLTP is responsible for the net mass transfer of phospholipid from triglyceride rich lipoprotein towards HDL. Whereas PLTP has no intrinsic cholesteryl ester transfer activity, it enhances the transfer of cholesteryl ester from HDL to VLDL and LDL. Thus PLTP might be a determinant factor in modulating the CETP mediated redistribution of cholesteryl esters between pro-(LDL) and anti-(HDL) atherogenic lipoproteins.